US3586831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat response control circuit
Assignee: Hitachi Global Life Solutions Inc
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Filing: 1969-12-30
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Granted: 1971-06-22
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Expires: 1989-12-30
Abstract
Abstract A heat response control circuit using a compound of a low hygroscopic polyamide resin and a surface activator as a heat sensitive material, and combining a rectifying element having a control electrode and its accessory device with said heatsensitive means such that a prescribed temperature may be maintained within a usual temperature range; heating is automatically discontinued in the case of accidental overheating, but is automatically reset when cooled down to within the usual temperature range.
Inventors
- 👤 Akisada Naoi
- 👤 Masaaki Kubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:43
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/2033; G05D23/2036; G05D23/1906; G05D23/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
195 words
A heat response control circuit comprising control means consisting of a rectifier element having a control electrode and an accessory unit to control the load current by controlling the conduction angle of said rectifier element by varying the ignition angle and breaking the load current by suppressing the ignition; heat-sensitive means connected to said control means to store electric charges for causing ignition up to a certain temperature; characterized in that said heat-sensitive means is made of a compound of polyamide and a surface activator having a pair of conductors separated by a control layer of said heatsensitive polyamide compound, the electrical characteristics of said control layer being such that the electric resistance component decreases with temperature while the capacitance compound increases gradually up to a certain temperature but rapidly thereabove, means responsive to said characteristics to control the ignition angle of said control means to vary within a certain temperature range with electric charges stored between said conductors due to a capacitance variation of said control layer while thereabove the ignition becomes substantially impossible due to a decrease in electric charges as caused by a decrease in electric resistance and an increase in capacitance.
Claim 2
Dependent Claim
195 words
A heat response control circuit comprising control means consisting of a rectifier element having a control electrode and an accessory unit to control the load current by controlling the conduction angle of said rectifier element by varying the ignition angle and breaking the load current by suppressing the ignition; heat-sensitive means connected to said control means to store electric charges for causing ignition up to a certain temperature; characterized in that said heat-sensitive means is made of a compound of polyamide and a surface activator having a pair of conductors separated by a control layer of said heatsensitive polyamide compound, the electrical characteristics of said control layer being such that the electric resistance component decreases with temperature while the capacitance compound increases gradually up to a certain temperature but rapidly thereabove, means responsive to said characteristics to control the ignition angle of said control means to vary within a certain temperature range with electric charges stored between said conductors due to a capacitance variation of said control layer while thereabove the ignition becomes substantially impossible due to a decrease in electric charges as caused by a decrease in electric resistance and an increase in capacitance.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |